EP3484964B1 - Composition de revêtement en latex ayant des propriétés de réduction de l'arôme réduites - Google Patents

Composition de revêtement en latex ayant des propriétés de réduction de l'arôme réduites Download PDF

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Publication number
EP3484964B1
EP3484964B1 EP17748971.3A EP17748971A EP3484964B1 EP 3484964 B1 EP3484964 B1 EP 3484964B1 EP 17748971 A EP17748971 A EP 17748971A EP 3484964 B1 EP3484964 B1 EP 3484964B1
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Prior art keywords
coating composition
polymer
coating
acid
article
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EP17748971.3A
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German (de)
English (en)
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EP3484964A1 (fr
Inventor
Robert M. O'brien
Mark Stuetelberg
Arthur RIAZZI
Mary Jo SCANDOLARI
Nhan T. HUYNH
Nikolaus J. Koch
Samuel PUAUD
David M. Riddle
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Swimc LLC
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Swimc LLC
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/02—Emulsion paints including aerosols
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • C09D133/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C09D133/08—Homopolymers or copolymers of acrylic acid esters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/02—Processes for applying liquids or other fluent materials performed by spraying
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/22—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes
    • B05D7/227—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to internal surfaces, e.g. of tubes of containers, cans or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/12—Cans, casks, barrels, or drums
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F2/00—Processes of polymerisation
    • C08F2/12—Polymerisation in non-solvents
    • C08F2/16—Aqueous medium
    • C08F2/22—Emulsion polymerisation
    • C08F2/24—Emulsion polymerisation with the aid of emulsifying agents
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
    • C08F212/02—Monomers containing only one unsaturated aliphatic radical
    • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
    • C08F212/06—Hydrocarbons
    • C08F212/08—Styrene
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/26—Esters containing oxygen in addition to the carboxy oxygen
    • C08F220/32—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals
    • C08F220/325—Esters containing oxygen in addition to the carboxy oxygen containing epoxy radicals containing glycidyl radical, e.g. glycidyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D123/00—Coating compositions based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
    • C09D167/08—Polyesters modified with higher fatty oils or their acids, or with natural resins or resin acids
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/10—Metallic substrate based on Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D2202/00—Metallic substrate
    • B05D2202/20—Metallic substrate based on light metals
    • B05D2202/25—Metallic substrate based on light metals based on Al

Definitions

  • the invention also provides a method of preparing a coated food or beverage can, or a portion thereof.
  • the method includes forming a composition that includes an emulsified latex polymer, including: forming an aqueous dispersion of an emulsifying polymer having an Mn of at least about 8,500 in a carrier comprising water and an optional organic solvent; combining an ethylenically unsaturated monomer component with the aqueous dispersion; polymerizing the ethylenically unsaturated monomer component in the presence of the aqueous dispersion to form an emulsified latex polymer that can provide a cured coating film having a Tg of at least about 40° C; and applying the composition including the emulsified latex polymer to a metal substrate prior to or after forming the metal substrate into a food or beverage can or portion thereof.
  • applying the composition to such metal substrate includes applying the composition to a metal substrate in the form of a planar coil or sheet, hardening the emulsified latex polymer, and forming the substrate into a food or beverage can or portions thereof.
  • applying the composition to such metal substrate comprises applying the composition to the metal substrate after the metal substrate has been formed into a can or portion thereof.
  • carboxylic acids include, but are not limited to, acrylic acid, methacrylic acid, alpha-chloroacrylic acid, alpha-cyanoacrylic acid, betamethylacrylic acid (crotonic acid), alpha-phenylacrylic acid, beta-acryloxypropionic acid, sorbic acid, alpha-chlorosorbic acid, angelic acid, cinnamic acid, p-chlorocinnamic acid, beta-stearylacrylic acid, itaconic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, maleic acid, fumaric acid, tricarboxyethylene, maleic anhydride, and mixtures thereof.
  • Non-limiting examples of useful ethylenically unsaturated acid-functional monomers include acids such as, for example, acrylic acid, methacrylic acid, alpha-chloroacrylic acid, alpha-cyanoacrylic acid, crotonic acid, alpha-phenylacrylic acid, beta-acryloxypropionic acid, fumaric acid, maleic acid, sorbic acid, alpha-chlorosorbic acid, angelic acid, cinnamic acid, p-chlorocinnamic acid, beta-stearylacrylic acid, citraconic acid, mesaconic acid, glutaconic acid, aconitic acid, tricarboxyethylene, 2-methyl maleic acid, itaconic acid, 2-methyl itaconic acid, methyleneglutaric acid, and the like, or mixtures thereof.
  • acids such as, for example, acrylic acid, methacrylic acid, alpha-chloroacrylic acid, alpha-cyanoacrylic acid, crotonic acid, alpha
  • the disclosed water-dispersing groups may be used in place of, or in addition to, acid or anhydride groups.
  • anionic salt groups include sulphate groups (-OSO 3 - ), phosphate groups (-OPO 3 - ), sulfonate groups (-SO 2 O - ), phosphinate groups (-POO - ), phosphonate groups (-PO 3 - ), and combinations thereof.
  • trimers may include a trimerization product prepared from on average three diisocyanate molecules or a trimer prepared from on average three moles of diisocyanate (e.g., HMDI) reacted with one mole of another compound such as, for example, a triol (e.g., trimethylolpropane).
  • HMDI diisocyanate
  • a triol e.g., trimethylolpropane
  • blocking agents include malonates, such as ethyl malonate and diisopropyl malonate, acetylacetone, ethyl acetoacetate, 1-phenyl-3-methyl-5-pyrazolone, pyrazole, 3-methyl pyrazole, 3,5 dimethyl pyrazole, hydroxylamine, thiophenol, caprolactam, pyrocatechol, propyl mercaptan, N-methyl aniline, amines such as diphenyl amine and diisopropyl amine, phenol, 2,4-diisobutylphenol, methyl ethyl ketoxime, alpha-pyrrolidone, alcohols such as methanol, ethanol, butanol and t-butyl alcohol, ethylene imine, propylene imine, benzotriazoles such as benzotriazole, 5-methylbenzotriazole, 6-ethylbenzotriazole, 5-chlorobenzotriazole and 5-nitrobenz
  • Such additional polymeric materials can be nonreactive, and hence, simply function as fillers.
  • Such optional nonreactive filler polymers include, for example, polyesters, acrylics, polyamides, polyethers, and novalacs.
  • additional polymeric materials or monomers can be reactive with other components of the composition (e.g., an oxirane-functional emulsified latex polymer).
  • reactive polymers can be incorporated into the disclosed compositions, to provide additional functionality for various purposes, including crosslinking. Examples of such reactive polymers include, for example, functionalized polyesters, acrylics, polyamides, and polyethers.
  • Preferred optional polymers are substantially free of mobile and bound BPA, BPF and BPS, and preferably are also substantially free of aromatic glycidyl ether compounds (e.g., BADGE, BFDGE and epoxy novalacs).
  • catalysts include, but are not limited to, strong acids (e.g ., dodecylbenzene sulphonic acid (DDBSA, available as CYCAT 600 from Cytec), methane sulfonic acid (MSA), p-toluene sulfonic acid (pTSA), dinonylnaphthalene disulfonic acid (DNNDSA), trifluoromethanesulfonic acid (triflic acid), quaternary ammonium compounds, phosphorous compounds, and tin and zinc compounds.
  • strong acids e.g ., dodecylbenzene sulphonic acid (DDBSA, available as CYCAT 600 from Cytec
  • MSA methane sulfonic acid
  • pTSA p-toluene sulfonic acid
  • DNNDSA dinonylnaphthalene disulfonic acid
  • triflic acid trifluoromethanesulfonic acid
  • a catalyst is preferably present in an amount of at least 0.01 wt. %, and more preferably at least 0.1 wt. %, based on the weight of nonvolatile material. If used, a catalyst is preferably present in an amount of no greater than 3 wt. %, and more preferably no greater than 1 wt. %, based on the weight of nonvolatile material.
  • butyl CELLOSOLVE TM from Dow Chemical Co. and diethylene glycol monomethyl ether ( viz ., butyl CARBITOL TM from Dow Chemical Co.); ketones such as acetone and methyl ethyl ketone (MEK); N,N-dimethylformamides; carbonates such as ethylene carbonate and propylene carbonate; diglymes; N-methylpyrrolidone (NMP); acetates such as ethyl acetate, ethylene diacetate, propylene glycol monoacetate, propylene glycol diacetate and glycol ether acetates; alkyl ethers of ethylene; isophorones; aromatic solvents such as toluene and xylenes; and combinations thereof.
  • ketones such as acetone and methyl ethyl ketone (MEK); N,N-dimethylformamides; carbonates such as ethylene carbonate and propylene carbonate; diglymes; N-methylpyrroli
  • Embodiments of the disclosed coating composition may for example contain at least about 10, at least about 15 or at least about 18 wt. % and up to about 30, up to about 25 or up to about 23 wt. % of the emulsified latex polymer; at least about 45, at least about 55 or at least about 60 wt. % and up to about 85, up to about 80 or up to about 70 wt. % water, and at least about 5, at least about 7 or at least about 10 wt. % and up to about 20, up to about 16 or up to about 13 wt. % organic solvent.
  • the disclosed coating compositions may be present as a layer of a mono-layer coating system or as one or more layers of a multi-layer coating system.
  • the coating composition can be used as a primer coat, an intermediate coat, a top coat, or a combination thereof.
  • the coating thickness of a particular layer and of the overall coating system will vary depending upon the coating material used, the substrate, the coating application method, and the end use for the coated article.
  • Mono-layer or multi-layer coating systems including one or more layers formed from the disclosed coating composition may have any suitable overall coating thickness, and typically are applied, using the mixed units commonly employed in the packaging industry, at coating weights of about 1 to about 20 mg/in 2 (msi) and more typically at about 1.5 to about 10 msi.
  • each can is passed through a thermal, ultraviolet or electromagnetic curing oven to harden (e.g., dry and cure) the coating.
  • the residence time of the coated can within the confines of the curing oven is typically from 1 minute to 5 minutes.
  • the curing temperature within this oven will typically range from 150 to 220° C.
  • a sheet coating is described as the coating of separate pieces of a variety of materials (e.g ., steel or aluminum) that have been pre-cut into square or rectangular "sheets." Typical dimensions of these sheets are approximately one square meter. Once coated, each sheet is cured. Once hardened ( e.g ., dried and cured), the sheets of the coated substrate are collected and prepared for subsequent fabrication. Sheet coatings provide coated metal (e.g ., steel or aluminum) substrates that can be successfully fabricated into formed articles, such as two-piece drawn food cans, three-piece food cans, food can ends, drawn and ironed cans, beverage can ends, and the like.
  • coated metal e.g ., steel or aluminum
  • a side seam coating is described as the spray application of a liquid coating over the welded area of formed three-piece food cans.
  • a rectangular piece of coated substrate is formed into a cylinder.
  • the formation of the cylinder is rendered permanent due to the welding of each side of the rectangle via thermal welding.
  • each can typically requires a layer of liquid coating, which protects the exposed "weld” from subsequent corrosion or other effects of the contained foodstuff.
  • the liquid coatings that function in this role are termed "side seam stripes.” Typical side seam stripes are spray applied and cured quickly via residual heat from the welding operation in addition to a small thermal, ultraviolet, or electromagnetic oven.
  • Preferred coating compositions display one or more of the properties described in the Examples Section. More preferred coating compositions display one or more of the following properties: metal exposure value of less than 1 mA; metal exposure value after drop damage of less than 1.5 mA; global extraction results of less than 50 ppm; less than about 50%, preferably less than about 30% and more preferably less than about 10% aldehyde loss when evaluated for flavor scalping (and more preferably less than about 50%, less than about 30% or less than about 10% of the aldehyde loss exhibited by currently employed coatings for aluminum cans containing carbonated colas); adhesion rating of 10; blush rating of at least 7; slight or no crazing in a reverse impact test; no craze (rating of 10) in a dome impact test; feathering below 0.2 inch; COF range of 0.055 to 0.3; an initial end continuity of less than 10 mA (more preferably less than 5, 2, or 1 mA); and after pasteurization or retort, a continuity of less than 20 mA
  • Drop damage resistance measures the ability of the coated container to resist cracks after being in conditions simulating dropping of a filled can.
  • the presence of cracks is measured by passing electrical current via an electrolyte solution, as previously described in the Initial Metal Exposure section.
  • a coated container is filled with the electrolyte solution and the Initial Metal Exposure current is recorded.
  • the can is then filled with water and dropped through a tube from a height of 61 cm onto a 33° inclined plane, causing a dent in the chime area.
  • the can is then turned 180 degrees, and the process is repeated. Water is then removed from the can and metal exposure current is again measured as described above. If there is no damage, no change in current (mA) will be observed. Typically, an average of 6 or 12 container runs is recorded.
  • the reaction mixture was stirred for five minutes after which a premix of 2.892 parts erythorbic acid, 249.971 parts deionized water, 2.892 parts DMEOA, and 0.257 parts iron complex aqueous solution was added over two hours.
  • the contents of the reaction vessel were allowed to increase in temperature due to the reaction. Cooling was applied when the temperature increased to 65° C, and stopped when the temperature decreased to 60° C.
  • the premix vessel was rinsed with 773.194 parts deionized water and the rinse was added to the reaction vessel. The reaction mixture was held for one hour and cooled to below 49° C.
  • Coating compositions were prepared from the low and high Tg versions of Control Emulsion Nos. 1 and 2, applied inside metal beverage containers, cured, and evaluated.
  • the coating composition ingredients were added in the order shown below in Table 1 with agitation.
  • DMEOA was added as needed to obtain a desired final viscosity.
  • the coating compositions were sprayed from below into the interior of 355 ml aluminum cans using typical laboratory conditions and a 100 to 130 mg/can coating weight, and cured at 188 to 199 °C (as measured at the can dome) for 30 seconds through a gas oven conveyor at typical heat schedules for this application.
  • the application and film properties are shown below in Table 2.
  • Coating compositions made using Example 2, Run 1 (Low Tg) ( viz ., the low Tg version of Control Emulsion No. 1) and the Example 3 Test Emulsion were prepared as shown below in Table 3.
  • the compositions were spray-applied inside metal beverage containers, cured and evaluated as in Example 2.
  • the application and film properties are shown below in Table 4.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Dispersion Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Paints Or Removers (AREA)
  • Rigid Containers With Two Or More Constituent Elements (AREA)
  • Details Of Rigid Or Semi-Rigid Containers (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Claims (16)

  1. Composition de revêtement comprenant :
    un polymère de latex émulsifié comprenant un produit de réaction d'ingrédients incluant un composant monomère à insaturation éthylénique polymérisé en présence d'une dispersion aqueuse d'un polymère émulsifiant ayant une masse moléculaire moyenne en nombre (Mn) de 8500 à 50 000,
    dans laquelle un film durci de la composition de revêtement a une température de transition vitreuse (Tg) d'au moins 40 °C, et
    dans laquelle la composition de revêtement est sensiblement dépourvue de chacun parmi bisphénol A, bisphénol F, et bisphénol S, y compris des époxydes de ceux-ci.
  2. Procédé, comprenant :
    la fourniture d'une composition de revêtement selon la revendication 1 ; et
    l'application de la composition de revêtement à un substrat métallique avant ou après formation du substrat métallique en une boîte d'aliment ou de boisson ou partie de celle-ci.
  3. Article comprenant :
    un ou plusieurs parmi une partie de corps ou une partie d'extrémité d'une boîte d'aliment ou de boisson comprenant un substrat métallique ; et
    une composition de revêtement selon la revendication 1 disposée sur celui-ci.
  4. Composition de revêtement selon la revendication 1, procédé selon la revendication 2, ou article selon la revendication 3, dans lequel le polymère émulsifiant est polymérisé en solution dans un solvant organique.
  5. Composition de revêtement selon l'une quelconque des revendications 1 ou 4, procédé selon l'une quelconque des revendications 2 ou 4, ou article selon l'une quelconque parmi la revendication 3 ou 4, dans lequel la composition de revêtement comprend une composition de revêtement durcie.
  6. Composition de revêtement selon l'une quelconque des revendications 1, 4, ou 5, procédé selon l'une quelconque des revendications 2, 4, ou 5, ou article selon l'une quelconque des revendications 3 à 5, dans lequel le composant monomère à insaturation éthylénique comprend un mélange de monomères qui inclut au moins un monomère à insaturation alpha, bêta-éthylénique contenant un groupe à fonctionnalité oxirane en une quantité de 0,1 % en poids à 30 % en poids, sur la base d'un poids total du mélange de monomères.
  7. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 6, procédé selon l'une quelconque des revendications 2 ou 4 à 6, ou article selon l'une quelconque des revendications 3 à 6, dans lequel le polymère émulsifiant :
    a) est un sel polymère qui inclut des groupes sel anionique, des groupes sel cationique, ou une combinaison de ceux-ci ; ou
    b) comprend un polymère acrylique, un polymère polyuréthane, une résine de polyester, une résine alkyde, une polyoléfine, ou une combinaison de ceux-ci ; ou
    c) comprend un polymère acrylique à fonctionnalité acide ou anhydride, ou un sel de celui-ci, ou dans lequel le polymère émulsifiant comprend un sel d'un polymère à fonctionnalité acide ou anhydride et d'une amine.
  8. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 7, procédé selon l'une quelconque des revendications 2 ou 4 à 7, ou article selon l'une quelconque des revendications 3 à 7, dans lequel le polymère émulsifiant a une masse moléculaire moyenne en nombre de 10 000 à 20 000.
  9. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 8, procédé selon l'une quelconque des revendications 2 ou 4 à 8, ou article selon l'une quelconque des revendications 3 à 8, dans lequel le composant à insaturation éthylénique constitue 40 à 80 % en poids et le polymère émulsifiant constitue 20 à 60 % en poids du polymère de latex émulsifié, sur la base du poids total du composant monomère à insaturation éthylénique et du polymère émulsifiant, et dans lequel le polymère émulsifiant a un indice d'acide de 40 à 400 milligrammes (mg) de KOH par gramme de polymère émulsifiant.
  10. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 9, procédé selon l'une quelconque des revendications 2 ou 4 à 9, ou article selon l'une quelconque des revendications 3 à 9, dans lequel le composant monomère à insaturation éthylénique est polymérisé en présence de la dispersion aqueuse avec un initiateur de radicaux libres hydrosoluble à une température de 0 °C à 100 °C.
  11. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 10, procédé selon l'une quelconque des revendications 2 ou 4 à 10, ou article selon l'une quelconque des revendications 3 à 10, dans lequel la composition de revêtement est sensiblement dépourvue de quelconques motifs structuraux dérivés d'un bisphénol.
  12. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 11, procédé selon l'une quelconque des revendications 2 ou 4 à 11, ou article selon l'une quelconque des revendications 3 à 11, dans lequel la composition de revêtement présente moins de 50 % de perte d'aldéhyde lorsqu'on évalue pour une dégradation d'arôme comme décrit ici.
  13. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 12, procédé selon l'une quelconque des revendications 2 ou 4 à 12, ou article selon l'une quelconque des revendications 3 à 12, dans lequel la composition de revêtement présente moins de 10 % de perte d'aldéhyde lorsqu'on évalue pour une dégradation d'arôme comme décrit ici.
  14. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 13, procédé selon l'une quelconque des revendications 2 ou 4 à 13, ou article selon l'une quelconque des revendications 3 à 13, dans lequel la composition de revêtement :
    a) est appropriée pour former un revêtement intérieur durci continu par pulvérisation sur une surface intérieure d'une boîte de boisson en aluminium emboutie et étirée en deux pièces lorsqu'elle est pulvérisée sur une telle surface à un poids de revêtement de 0,16 à 3,1 mg/cm2 (1 à 20 mg/po2) ;
    b) inclut 10 à 40 % en poids du polymère de latex émulsifié ;
    c) a une viscosité allant de 20 à 50 secondes en utilisant une coupe de viscosité Ford n° 2 à 25 °C ;
    d) le composant à insaturation éthylénique constitue 40 à 80 % en poids du polymère de latex émulsifié et le polymère émulsifiant constitue 20 à 60 % en poids du polymère de latex émulsifié, sur la base du poids total du composant monomère à insaturation éthylénique et du polymère émulsifiant ; et
    e) le polymère émulsifiant a un indice d'acide de 40 à 400 milligrammes (mg) de KOH par gramme de polymère émulsifiant.
  15. Composition de revêtement selon l'une quelconque des revendications 1 ou 4 à 14, procédé selon l'une quelconque des revendications 2 ou 4 à 14, ou article selon l'une quelconque des revendications 3 à 14, dans lequel la composition de revêtement, lorsqu'elle est appliquée par pulvérisation à l'intérieur d'une boîte de boisson en aluminium de 355 ml à un poids de revêtement de 100 à 130 mg/boîte, fournit une valeur d'exposition de métal inférieure à 3,5 mA après un test de dommage après chute tel que décrit ici.
  16. Article selon l'une quelconque des revendications 3 à 15, dans lequel la boîte d'aliment ou de boisson contient un produit de type aliment ou boisson.
EP17748971.3A 2016-07-15 2017-07-13 Composition de revêtement en latex ayant des propriétés de réduction de l'arôme réduites Active EP3484964B1 (fr)

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MX2017007830A (es) 2014-12-24 2017-09-18 Valspar Sourcing Inc Composiciones de revestimiento libres de estireno para envasar articulos tales como envases de alimentos y bebidas.
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US11981822B2 (en) 2014-12-24 2024-05-14 Swimc Llc Crosslinked coating compositions for packaging articles such as food and beverage containers
AR108133A1 (es) 2016-04-15 2018-07-18 Valspar Sourcing Inc Composiciones de revestimiento que contienen copolímeros libres de estireno
US20200385602A1 (en) 2016-07-15 2020-12-10 Swimc Llc Latex coating composition having reduced flavor scalping properties
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EP3676336A1 (fr) 2017-09-01 2020-07-08 Swimc Llc Latex polymères à plusieurs étages, compositions de revêtement contenant de tels latex, et articles revêtus de ces compositions
BR112020003920A2 (pt) 2017-09-01 2020-11-03 Swimc Llc composição de revestimento aquosa, artigo, e, método para fabricação de um recipiente ou componente de recipiente para alimento ou bebida revestido
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WO2018013766A1 (fr) 2018-01-18
MX2019000650A (es) 2019-06-03
EP3484964A1 (fr) 2019-05-22
CA3030957A1 (fr) 2018-01-18
KR20190040196A (ko) 2019-04-17
ZA201900958B (en) 2022-08-31
US20200385602A1 (en) 2020-12-10
BR112019000804A2 (pt) 2019-04-24
JP2019524571A (ja) 2019-09-05
CN109715739A (zh) 2019-05-03
JP2022043187A (ja) 2022-03-15
EP4086314A1 (fr) 2022-11-09
JP7324705B2 (ja) 2023-08-10

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